Collaboration needs, there is no more concerns of the reviewed drawings has
been changed unexpected, while the mark up is still clear and easy to be
enclosed.

Now you can protect your works with this DWGLock software, the entities in the send out drawings can NOT be copied nor changed. However, recipients can open up the drawing, add lines and markups. Only the drawing owner allows extracting the drawing, if they need to, enclosing theadded part with the native drawing.